Arc-lamp.



C. C. HUGHES.

ARG LAMP.

APPLIGATION TILED AUG. a1, 1911.

Patented Feb. 17, 1914.

2 SHEETS-SHEET 1.

C. C. HUGHES.

ARG LAMP.

APPLICATION FILED AUG. s1, 1911.

1,087,377, Patented Feb..17,1914.

.lll-

@uvm/tto@ UNITED STATES PATENT OFFICE.

CHARLES C. HUGHES, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HUGHESUNIVERSAL ARC LAMP COMPANY, OF PHILADELPHIA, PENNSYLVANIA.

ABC-LAMP.

Specification of Letters Patent.

Patented Feb. 17, 1914.

To all whom it may concern:

Be it known that I,`CHARLEs C. HUGHES, a citizen of the United States,residing at Philadelphia, State of Pennsylvania, have invented certainnew and useful Improvements in Arc-Lamps; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such las will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to certain novel and useful improvements in arclamps and has particular application to lamps of the hot wire type. v

In carrying out my invention it is my purpose to `provide means wherebyAone of the carbons`may be automatically adjusted relative to the otherthrough the medium of a thermo-expansive wire with which it isoperatively connected.

Itis also my purpose to provide a lamp of this type in which thefriction of the operating parts is reduced to a minimum and such partsare so correlated and arranged as to work positively and elicientlyunder all conditions.

I also aim to provide a lamp which will embody the desired features oflsimplicity and reliability. Y

With the above recited objects and others of a similar nature in view,'my invention consists in the construction, combination and arrangementof parts set forth in and falling within the scope of the appendedclaims.

lFigure 1 is a view in side elevation of myimproved lamp, certain of theparts being shown in section. Fig. 2 is an enlarged View 'of the lamp,taken partly invertical section and artly in elevation, the lowerportion of the amp being broken away. Fi 3 is a horizontal sectionalview taken on ine 3 3 of Fig. 1. Fig. 4 is a sec ional view taken ontheline 4 4 of Fig. 1. ig. 5 is a sectional view taken on the line 5 5of Fig. 1. Fig. 6 is a sectional view taken on the line 6 6 of vFig. 8.Fig. 7 is a sectional view taken on y 11 and 12 respectively which areconnected by means of the vertical standards 13, the opposite ends ofwhich are reduced and threaded as at 14 to extend through relnforcinginsulating sleeves 15 located in apertures 16-in the plates 11 and 12.The lower plate 12 has secured to its under face by means of suitablefastenings 17, a depending bracket 18 which is provided with an annularflange 19 into which the fastenings 17 extend. Y

The numeral 20 indicates a plate located at the under side of thebracket 18 and held in spaced relation therefrom by thevinterposedinsulating disk 21. Through the alining apertures 23 of the bracket andinsulating plate and, base plate respectively extend insulating sleeves22 for the purpose hereinafter described. The annular ange 19 isprovided at opposite sides with threaded apertures 25 for the receptionof set screws 26 yto which latter are connected the upper ends ofretractile springs 27, the lower ends of said springs being secured tothe upper ends of the globe supporting bracket 28.

The lower carbon of the lamp is shown at 29 and is designed to seat informed by flanges carried by the plate 31. This plate 31 is providedwith vertical supporting rods 32 extending at their upper ends throughthe sleeves 22 and provided with adjustable nuts 33 for holding thecarbon socket against displacement. Extending through the opening 34 inthe plate 12 is\a binding post 35 ywhich engages with the contact plate36 carried by the adjacent supporting rod 32. A flexible conducting -1nsulating wire 37 is connected at one terminal to this binding post 35and extends to the .upper plate 11, to which it is Vconnected by meansof the binding post 38. From this post it extends through a centralaperture 39 formed .in the plate 11 and is attached to the plug 40support-ed by the hood 41, which hood is held in spaced relation to theplate 11 by the supporting bolts 32. It is, of course, to be understoodthat the plugs 40 are designed to be connected with any suitable sourceof current supply.

The bindingl ost 38 is connected with a plate 42, whic Ilatter isprovided with ears 43 carryingthe pivoted bar 44 which.is adjustable bymeans of a set screw 45 threaded through one end of the bar 44 andadapted to contact with the plate 42. At the oppothe socket 30 site end`of the bar 44 from the binding post 38 is a spring clip 46 holding thethermoexpansive wire 47 which passes downwardly over the pulley 48carried by the bracket 49 on the adjacent standard 13, said wire passingthence upwardly over the spaced pulleys 50 carried by the brackets 51attached tothe under side lof the top plate 11. The wire thence passesdownwardly under the pulley 52 carried by the pivoted clevis 53 andthence upwardly to the binding post 54 supported by the bracket 55 whichdepends from the lower side of the upper plate 11 from which it is heldagainst contact by a strip of insulating material 56. The wire 47 isheld in contact with the depending extension of the bracket 55 by meansof the spring clip 57. A binding post 58 is attached to the bracket 55and has secured thereto one terminal of the artificial resistance 59which surrounds one of the guide rods 60 attached to the plates 11 and12 for the purpose hereinafter described.

The upper carbon is shown at 61 and is designed to be received by thesleeve 62. This sleeve is provided with spaced parallel plates 63 in theends of which are journaled guide rollers 64 designed to bear againstand slide upon the spaced parallel guide rods 60.

One of the plates 63 carries a set screw 65 to which is connected an endof the coiled portion of the artificial resistance 59.

The numeral 70 indicates a plate mounted on one of the standards 15 andoffset as at 71, to receive the adjustable pin 72 which is retained inposition by the locking nut 73. The lower end of the pin 72 hasconnected thereto the upper end of the retractile spring 74, the lowerend of the latter being designed to engage in one of the series ofnotches 75 formed in the under side of the arm 76 pivoted at 77 to thestandard 13 carrying the plate 70. The before-mentioned clevis 53 ispivoted at its 'lower end to the short extension of the lever 76. Thevopposite or inner end of this lever is provided with an interiorlythreaded opening 78 for the reception of the operating bolt 79. As willbe seen by reference to Fig. 9, the end face of the lever and theadjacent face of the bolt 79 are formed to produce parallel shoulders80, while 81 indicates a roller rotatably mounted upon the bolt 7 9'.

This roller is grooved as at 82 at opposite ends to produce ball racesfor the ball bearings 83 which form anti-friction means so `,that theroller may move readily upon its bearings. This roller 81 is designed tobear against and operate the clutch member 84 of the upper carbon, aswill be hereinafter described. This clutch member 84 is best shown inFigs. 6 and 8 and comprises a sleeve block 85 slidable upon the lowerportion of the upper carbon 61' and is provided with oppositely disposedpairs of extensions 86 and 87. These latter are each formed withlongitudinal notches 88. For t-he reception at the ends of the axles 89,each axle is formed with flanges 90 to contact with the adjacent sidesof the extensions 86 and 87. GrroovedV rollers 91 are rotatably mountedupon the axles 89 and are formed at their ends with ball races 92 inwhich are located ball bearings 93 for engagementwith the axle 89, theflanges 90 and the rollers 91 thereby lessening the friction upon thevertical movement of the clutch member 84. A guide plate 94 is securedto the block 85 and is provided with opposite ends 95 to engage theouter sides of the guide rod 60 thereby maintaining the clutch member 84against accidental displacement. The block 85 is further formed with aslot 96 at the sides of which are ears 97.

98 indicates a cam lever which is pivoted between the ears and isadapted to bear at its inner end against the carbon. The outer portionof the lever is constructed similar to the inner or free end of thelever 76, that is to say, is provided with a threaded socket 99 in whichis located a bearing bolt 100. On this bolt is journaled a roller 101,formed with a ball race 102 to receive ball bearings 103 for lesseningthe friction between the 'roller and the members whereby it issupported. This roller is designed to extend transversely across andrest upon the roller 81 causing the cam lever to engage and release thecarbon. upon the operation of the lever'76 caused by the expansion andcontraction of the thermo-expansive wire 47. A bracket 104 is secured tolthe upper side of the lower plate 12 in the path of the clutch 84 andlimits the downward movement of the latter. A conductor wire 105 isattached to one of the plugs 40 ano to the upper carbon 61, as shown at106 for the purpose of completing the circuit and supplying the current.j

` Iwish now to call attention to the rollers 48, 50 and 52. These arepreferably made of porcelain Land the supporting members therefor areeach formed of two sections 107 and 108, the upper ends of which arestamped outwardly to produce ball races 109 in which are located ballbearings 110. Axles 111 are provided for the rollers, the balls bearingupon the axles and against 4the sides of the roller. In order topreventl the rollers from cracking, as is liable to be caused by theexpansion and contraction of the wire 47 due to `the heating and coolingof the latter, these rollers 48, 50 and 52 are formed with openingsslightly greater than the diameters of the axles 111, which openings areprovided with longitudinal'corru- Agated bushings 112 which will permitthe necessary expansion and contraction. A plate 113 is secured to'thelower plate 12 and is formed with a vertically extending T-shapedprojection 114 which has connected to the opposite ends of its head 115coil springs 117 which .are in turn connected as indicated by thenumeral 118. These coil springs form the ordinary electrical resistancefor the lamp.

In order to suspend or hang the lamp any suitable means for this purposemay be connected with a convenient part of the lamp, such for instance,as the hood.

.When the lamp is properly arranged for lighting purposes and thecurrent is turned on to pass through the carbons in the usual manner,the thermo-expansive or hot Wire practically simultaneousl becomesheated and expands. This lengthening of the wire allows the short end ofthe lever 76 to move downward, this downward movement being assisted bythe action of the retractile spring 74, which, pulling upward moves theroller 81 into engagement with the roller 101, thus raising the lever 98and throwing the cam end of the latter into-engagement with the uppercarbon 61, raising the latter from engagement with the lower carbon 29by the further contraction of the spring? 74. As the distancebetween thecarbons increases the current passing through the wire 47 will beconstantly diminished, thus permitting the wire to cool sufficiently tocause its contraction and allowing of the upper move` ment of the'shortend of the lever 76. This upper movement of the lever 76 releases thelever 98 from its engagement with the upper carbon 61, releasing thelatter and allowing it to return .to its initial position in contactwith the lower carbon 29. The operation will then be repeated aspreviously described.

It will be seen that by means of my lamp the upper carbon will beproperl and adually fed through the sleeve o the c utch member as thecarbon is consumed, thus always maintaining the two carbons in properposition to produce uniform light.

`What I claim is:

1. In an arc lamp, the combination with fixed and movable carbons, of acontinuous .length of expansible circuitously arranged pansible wirearranged in circuit with the carbon, supporting members for the wire atdiiierent points of its length, constructed and arranged to permit theuniform and instant expansion of s uch wire through the successiveport-ions of its length ifnder the influence of a current of varyingintensity, and clutch mechanism engaging with one of said carbons andcontnclred by the contraction and expansion of t wire, for varying theposition of such carbon relative to the other carbon.

In ltestimony whereof, I aiiix my signature, in presence of twowitnesses.

CHARLES C. HUGHES.

Witnesses:

WALTER K. Woon,

T. JoHNs RIGBY.

